FileDialog.FilterIndex Properti

Definisi

Ruang nama:

System.Windows.Forms

Rakitan:

System.Windows.Forms.dll

Sumber:

FileDialog.cs

Mendapatkan atau mengatur indeks filter yang saat ini dipilih dalam kotak dialog file.

public:
 property int FilterIndex { int get(); void set(int value); };

public int FilterIndex { get; set; }

member this.FilterIndex : int with get, set

Public Property FilterIndex As Integer

Nilai Properti

Int32

Nilai yang berisi indeks filter yang saat ini dipilih dalam kotak dialog file. Nilai defaultnya adalah 1.

Contoh

Contoh kode berikut menggunakan OpenFileDialog implementasi FileDialog dan mengilustrasikan pembuatan, pengaturan properti, dan memperlihatkan kotak dialog. Contoh menggunakan Filter properti dan FilterIndex untuk menyediakan daftar filter untuk pengguna. Contoh memerlukan formulir dengan ditempatkan Button di atasnya dan System.IO namespace layanan ditambahkan ke dalamnya.

private:
   void button1_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      Stream^ myStream;
      OpenFileDialog^ openFileDialog1 = gcnew OpenFileDialog;

      openFileDialog1->InitialDirectory = "c:\\";
      openFileDialog1->Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
      openFileDialog1->FilterIndex = 2;
      openFileDialog1->RestoreDirectory = true;

      if ( openFileDialog1->ShowDialog() == System::Windows::Forms::DialogResult::OK )
      {
         if ( (myStream = openFileDialog1->OpenFile()) != nullptr )
         {
            // Insert code to read the stream here.
            myStream->Close();
         }
      }
   }

var fileContent = string.Empty;
var filePath = string.Empty;

using (OpenFileDialog openFileDialog = new OpenFileDialog())
{
    openFileDialog.InitialDirectory = "c:\\";
    openFileDialog.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
    openFileDialog.FilterIndex = 2;
    openFileDialog.RestoreDirectory = true;

    if (openFileDialog.ShowDialog() == DialogResult.OK)
    {
        //Get the path of specified file
        filePath = openFileDialog.FileName;

        //Read the contents of the file into a stream
        var fileStream = openFileDialog.OpenFile();

        using (StreamReader reader = new StreamReader(fileStream))
        {
            fileContent = reader.ReadToEnd();
        }
    }
}

MessageBox.Show(fileContent, "File Content at path: " + filePath, MessageBoxButtons.OK);

Private Sub button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim myStream As Stream = Nothing
    Dim openFileDialog1 As New OpenFileDialog()

    openFileDialog1.InitialDirectory = "c:\"
    openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*"
    openFileDialog1.FilterIndex = 2
    openFileDialog1.RestoreDirectory = True

    If openFileDialog1.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
        Try
            myStream = openFileDialog1.OpenFile()
            If (myStream IsNot Nothing) Then
                ' Insert code to read the stream here.
            End If
        Catch Ex As Exception
            MessageBox.Show("Cannot read file from disk. Original error: " & Ex.Message)
        Finally
            ' Check this again, since we need to make sure we didn't throw an exception on open.
            If (myStream IsNot Nothing) Then
                myStream.Close()
            End If
        End Try
    End If
End Sub

Keterangan

FilterIndex Gunakan properti untuk mengatur opsi pemfilteran mana yang diperlihatkan terlebih dahulu kepada pengguna. Anda juga dapat menggunakan nilai FilterIndex setelah menampilkan dialog file untuk melakukan operasi file khusus tergantung pada filter yang dipilih.

Nota

Nilai indeks entri filter pertama adalah 1.

Lihat juga

• CheckFileExists
• Filter